At his ninety-fourth birthday party, Jim was complimented on how good he looked and was asked about his health. He answered, “I feel good, except that some of my joints ache and are stiff, especially...

At his ninety-fourth birthday party, Jim was complimented on how good he looked and was asked about his health. He answered, “I feel good, except that some of my joints ache and are stiff, especially my knees and hips and lower back, and especially when I wake up in the morning.” A series of X-ray studies and an MRI scan taken a few weeks earlier showed that the articular cartilages of these joints were rough and flaking off and that bone spurs were present at the ends of some of Jim’s bones. What is Jim’s probable condition?